Ocarina 6.3
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* Move GSTDriver into either lib/ or core/ (allowing me to remove more callbacks)
* Schedule tests using bash script and not Sconscript
  * lets me handle multiple iterations by passing different number of parameters?
* Make sure core/ is completely documented, remove sections from DESIGN
* Move tag structures into separate files with separate tests.
  * include/core/tags/*.h?  core/tags/*.cpp?